FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

VENROCK ASSOCIATES V LP	2. Issuer Name and Ticker or Trading Symbol

CASTLIGHT HEALTH, INC. [ CSLT ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)	
(Last)          (First)          (Middle)

C/O VENROCK, 3340 HILLVIEW AVENUE	3. Date of Earliest Transaction (MM/DD/YYYY)

11/12/2015		
(Street)

PALO ALTO, CA 94304
(City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)

 	6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1.Title of Security
(Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code
(Instr. 8)	4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)	5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)	
			Code	V	Amount	(A) or (D)	Price				
Class B Common Stock  	11/12/2015  	 	P	  	22061  	A	$3.85  	1028061  	I  	By Funds   (1)	
Class B Common Stock  	11/13/2015  	 	P	  	56242  	A	$3.85  	1084303  	I  	By Funds   (2)	
Class B Common Stock  	11/16/2015  	 	P	  	51127  	A	$3.84  	1135430  	I  	By Funds   (3)	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code
(Instr. 8)	5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)	6. Date Exercisable and Expiration Date	7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)	8. Price of Derivative Security
(Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					

Explanation of Responses:	
(  1) 	Venrock Associates V, L.P. ("VA5") holds an aggregate of 927,654 shares, Venrock Partners V, L.P. ("VP5") holds an aggregate of 78,587 shares and Venrock Entrepreneurs Fund V, L.P. ("VEF5") holds an aggregate of 21,820 shares. Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (collectively, the "Venrock GP Entities") are the sole general partners of VA5, VEF5 and VP5 (collectively, the "Funds"), respectively, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.	
(  2) 	VA5 holds an aggregate of 978,403 shares, VP5 holds an aggregate of 82,886 shares and VEF5 holds an aggregate of 23,014 shares. The Venrock GP Entities are the sole general partners of the Funds, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.	
(  3) 	VA5 holds an aggregate of 1,024,499 shares, VP5 holds an aggregate of 86,860 shares and VEF5 holds an aggregate of 24,071 shares. The Venrock GP Entities are the sole general partners of the Funds, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
VENROCK ASSOCIATES V LP
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			
VENROCK PARTNERS V L P
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			
Venrock Entrepreneurs Fund V, L.P.
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			
Venrock Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			
Venrock Partners Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			
VEF Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		X			

Signatures		
/s/ David L. Stepp, authorized signatory		11/16/2015	
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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